Improvement in steam-boiler furnaces



Ctlntial (States @anni (titille.

AND GEORGE H. RUSSELL, SAME PLACE.

Letters Patent No. 98,238,

:lated December 28, 1869.

The Schedule referred `to :in these Letters Patent and making part of the same.

drawings, and to the letters of reference marked thereon, and being apart of'this specification, in

vwhich-- Figure l is a longitudinal section through the boiler and arch, taken on the line x-x in tig. 3.

Figure 2 is a side elevation of the arch, showing the supplementary.air-inlets; and

Figure 3 is an elevation ot' the front of the arch.

Like letters ref'er to like parts iu each ligure.

The nature of this invention relates to an improvemeut in the method ot' setting steam-generators, so that the entire products of' combustion of bituminous coal or other l'uel may be entirelyconsnmed.

It consists in so constructing the arch in which the boiler is encased and suspended, that a reverbcratory chamber is formed under the central portionl ot' the boiler, in which, hy the admission ofa fiesh supply of air, regulated in quantity to the requirements of' the fuel used, perl'ect combustion takes place. The llames passing thence under the boiler and through its tubes, impart their heat to the water containedin the boiler, as hereinafter described.

Also, in the arrangement of` the airducts and i'alves for introducing atmospheric air at the proper points to promote combustion, and regulating the supply to the requirements ot' circumstances.

' ln the drawings- A represents an arch of' brick or other material,- in which is suspended a tubular or other steam-generator, l.- y

Care the furnace-doors, through which fuel is iutrodnced; and

I) are draught-doors, opening into the ash-pit.

At the back ot` the grate, a bridge-wall, E, rises from the foundation to within a short distance from the bottom of the boiler.

Immediately in the rear of vthe bridge-wall is a diving-flue, l", into which thel products of combustion are compelled to pass. Leading into this llue from the ash-pit, is an air-duct, c, whose opening may be regulated or closed by a sliding damper, a', operated from the outside of' the arch.

B is a second air-duct, entering the flue near the first, but rising from a horizontal flue. inthe bottom of the arch. A damper or valve, b, at its mouth, serves to regulate the amount of air passing through this duct into the lille F.

At the end of the-flue F is a detlector-flange, f, which serves as a bridge-wall, to break up the column ot smoke and gases, and causes them to commingle with the ail-admitted with them in the reverberatory chamber G, in which the flue terminates.

Atthe re'ar end of' this chamber, a third air-duct,

c, delivers a supply of' air into the reverberatory' chamber.

This duct is also supplied with an external valve, c', as shown in 2. v

The arch G of' the reverberatory chamber is carried forward 4nearly to the bridge-wall.-

The opera-tion of` this improvement is` as follows:

Fuel is placed ou the grate and ignited, the draughtdoors D being opened for the admission of' air to support the combustion, which proceeds in the usual manner, the smoke and unconsumed gases passing with the llames over the bridge-wall into the flue F. Here a volume of air is brought through the duct a, into the flue, which air, mingling with the gases thrown ofi' by the fuel, the whole is drawninto the reverberatory chamber G, the flange f at the end ot the flue serving to break up 'and' intimately mix the air and gases, when perfect combustion ensues if' a. sullcient amount of oxygen have been admitted; if not, a further supply is introduced through the duct c, by opening its valve c', which will cause the gases to ignite and be consumed. rlhe flames passing ont ot the chamber at its front end', and over its arch G', and thence along the under side of the boiler, returning through its tubes, impart thereto the greatest per cent. of' available heat.

Under certain conditions it becomes necessary to close the draught-duras D, when, ot' course, no air 'will enter the flue through the duct c. In this case,

the valve b may be opened, and air admitted to the tlue through the duct b.

The valves c', 11', and` c', are intended` to regulate the admission ot' air to the unconsumed products ot' combustion in such amount as will insure their ignirtion and perfect combustion.

The walls of' the fines and reverberatory chamber being heated to a high degree, small particles ot'. carbon readily ignite from the heat radiated from them in. passing through. The currents of gases being also highly hea-ted in their passage, are ready to flash into flame as soon as the proper amount of oxygen comes in contact with them.

Locomotive and marine boilers may be constructed upon the principle herein described, by carrying back the water-legs of the furnace, and forming a reverberatory chamber within the shell, either with boilerplate shells haring circulation of water between them,

or built in with lire-brick or other refractory material.

What I claim as my invention, and desire to secure by Letters Patent, is-` In the construction of boiler-fmnaces, the flue F and reverberatory chamber G, provided with air-ducts c, b, c, furnished with appropriate valves a', b', and c', or their equivalents, the whole so arranged as to opexlate in thc manner and for the purpose herein set fort l.

Witnesses: RICHARD S. DILLON.

J. HENRY BAINES, H. F. EBERTS. 

